1 

     2 local softreq = function (...) return select(2, pcall(require, ...)); end

     3 

     4 module "hashes"

     5 

     6 local md5 = softreq("md5");

     7 if md5 then

     8 	if md5.digest then

     9 		local md5_digest = md5.digest;

    10 		local sha1_digest = sha1.digest;

    11 		function _M.md5(input)

    12 			return md5_digest(input);

    13 		end

    14 		function _M.sha1(input)

    15 			return sha1_digest(input);

    16 		end

    17 	elseif md5.sumhexa then

    18 		local md5_sumhexa = md5.sumhexa;

    19 		function _M.md5(input)

    20 			return md5_sumhexa(input);

    21 		end

    22 	else

    23 		error("md5 library found, but unrecognised... no hash functions will be available", 0);

    24 	end

    25 end

    26 

    27 return _M;